EXPLANATION OF PLATE XLVI. 



Tuhifex davidis, Benliam. 



Fig. 1. A dorsal bundle of chsetae from segment tI. 



„ 2. The outer moiety of a dorsal cliseta from one of the anterior 

 segments, showing intermediate teeth. (Camera x 480). 



„ 3. A Tentral chaeta from the posterior region. (Camera x 480). 



,, 4. A copulatory chaeta from the tenth segment. (Camera x 480). 



,, 5. The male apparatus of the right side, from a bisected specimen. 

 At. atrium; _/. sperm-funnel ; o. the male pore; p. penis ; pr. 

 prostate ; sp. sperm duct. 



,, 6. Tlie spermatheca of the right side and tlie copulatory ehseta (cop.) 

 in situ. 



Branchiura pleurotheca, Benliam. 



„ 7. A Tentral chaeta. (Camera X 480). 



,, 8. The male apparatus (without the sperm duct), seen in longitudinal 

 section, somewhat diagrammatically drawn. At. atrium, lined 

 by tall glandular cells ; d. duct, lined by cuticulated epithelium 

 continuous with the epidermis ; m. muscular coat ; «. neck, lined 

 by cubical cells ; o. tlie male pore ; pr. prostate cells ; sp. sperm 

 duct entering the atrium. 



„ 9. Tlie spermatheca of the left side. 



,, 10. A transA"erse section of the body (camera outline x 80), showing on 

 the right side the spermathecal pore, and on the left the chaetse, 

 which occur in the neighbouring section. D. dorsal chaetse ; d. 

 muscidar duct of the spermatheca; int. intestine, above it is the 

 dorsal blood trunk, below it the ventral ; nc. nerve cord ; spth. 

 spermatheca, the contained spermatozoa are omitted ; t. testis; 

 the eoelom is filled with developing spermatozoa. 



,, 11. The bunch of copulatory chaetse from segment xi. with their 

 muscles. 



;, 12, Integumental network of bloodvessels and its connection with the 

 dorsal and ventral trunks through the parietal vessels (jJv) ; Dv. 

 dorsal blood trunk ; Vr. ventral blood trunk. 



